The John Deere 30H6 is a genuine OEM expansion plug, also known as a cup plug, designed for a wide range of John Deere machinery. This critical component ensures proper sealing in engine blocks and other assemblies. With a precise diameter of 31.75 mm (1.250 inches) and a weight of approximately 0.01 kg (0.02 lbs), it provides reliable performance and exact fitment. This plug is compatible with numerous John Deere tractors, combines, sprayers, excavators, loaders, and other heavy equipment models, ensuring optimal system integrity and preventing fluid leaks.